Pedestal-chair.



P. P. DESPINS.

PEDESTAL CHAIR. APPLICATION FILED DEC. 21, 1912.

Patented Aug. 12, 1913.

6 SHEETS-SHEET 1.

@Qtmesses:

P. P. DESPINS.

PEDESTAL CHAIR.

APPLICATION FILED D120. 21, 1912.

Patented Au 12, 1913.

6 SHEETS-SHEET 2.

1 2 UGZZiOl: m

P. P. DESPINS.

PEDESTAL CHAIR.

APPLIGATION FILED DEC. 21, 1912.

Patented Aug. 12, 1913.

6 SHEETS-SHEET 3.

' P. P. DESPINS.

PEDESTAL CHAIR.

APPLIOATION FILED DBO. 21, 1912.

1,069,863 1 Patgnted Aug. 12, 1913.

6 SHEETSSHBBT 4.

i F i .1 posses.

PIERRE PAUL DESPINS, OF LYON, FRANCE.

PEDESTAL-CHAIR.

Specification of Letters Patent.

Patented Aug. 12,1913.

Application filed-December 21, 1912. Serial No. 738,058.

To all whom it may concern:

Be it known that I, PIERRE PAUL DESPINS, a citizen of the FrenchRepublic, residing at 8-1. Rue de la Buire, Lyon, France, have inventeda certain new and useful Improvement in Pedestal-Chairs, of which thefollowing is a specification.

This invention relates to pedestal chairs for dentists, barb'ers and thelike, and it has for its object an improved device which enables thelifting of the chair at any desired height by a pressure on an electricpush.

\Vith this object in view the invention consists in the combination witha base of any suitable form, of an electric motor lodged in a tightcasing in the interior of the base, a pump acted on by the motor, atelescopic standard and means for distributing oil under pressure to theworking parts of the pedestal.

A further object of the invention consists in the constructionhereinafter described which allows the lodging of the whole mechanism ina very limited space, and a perfect lubricating of-the moving parts ofthe apparatus.

In order that the invention may be easily understood it is representedin the annexed drawings in which Figure 1 is an elevation of thepedestal. Fig. 2 is a plan view of the same, partly in section on theline 22, Fig. 1. Fig. 3 is a sectional elevation on the line 33. Fig. 4is a plan view, partly in section, showing the position of the motor andthe pump. Fig. 5 is a vertical section of the pump on the line 55, Fig.4. Figs. 6, 7 and 8 are sections on lines 6-6, 77 and 8-8, respectively.Fig. 9 is an endview of the mechanism transmitting the movement from theelectric motor to the crank shaft of the pump. I

A is a cast iron base in formof basin divided in two tight chambers .bya partition base H having two supports H H for the crank shaft Ithecranks of which are at 120 its seat by a spring U.

and connected with the piston rods J, J J ()n the base H is also fixed asupplementary barrel G having a piston J constantly pushed upward by aspring K. i This pump may be worked by a pedal L (Figs. 1 and 2) asusual, if the electric current were accidentally broken.

The barrels G G Gr G communicate at their lower end, by means of holes 9provided with valvesg, with an oil tank M having a wire gauze M whichprevents the impurities contained in oil to pass through the barrels.All these devices are fixed by screws N to the base A of the apparatus.

At the end of the shaft I is keyed a' helicoidal wheel 0 which mesheswith a worm wheel P fixed on the shaft of the electricmotor E and whichtransmits the movement from this latterto the pumps withthe necessaryspeed reduction.

When the motor is running the oil contained in the tank M is suckedthrough the holes 9 of the barrels G G G and forced in the canal R whichis closed after each piston stroke by the valves S of the'barrels. Theoil thus; forced through the canal R to the hole T, forces open a valveU sliding in a hollow rod U and enters the chamber V, after which itpasses through the pipe X and lifts the telescopic tubes Y Y Y of thestandard in the manner hereinafter explained. As soon as the electricmotor stops the forcing back of the oil ceases, the valve U falls downon its seat under the pressure of a spring U and the flowing of oil isprevented. The lifting of the telescopic tubes Y Y Y? is thus stoppedand they are maintained in place by the oil. which cannot flow away.The. rod U is provided with a conical valve U which normally is pressedon In order to lower the telescopic tubes Y Y Y it is sutlicient toremove the 011 from under them. To that end a pressure is exerted on thehead u of the rod U v by means of a pedal Z (Figs. 1, 2 and 4). The

valve U then opens and the oil from the oil contained in the inner tubescirculates and lubricates the moving parts of the apparatus at everylowering of the standard. The lifting of this latter is obtained asfollows:Oi1 under pressure supplied by the pump to the pipe X and canald is discharged under the piston 6 Within a cylinder f screwed to thecenter of the base A; Suitable leathers e are provided, and the piston chas secured thereto the cylinder h, within' inner telescopic tube Y andpushes same in,

its lifting movement. When the large piston e arrives at the end of itsrun it is retained by the cap 8 screwed to the top of the tube f, andthe small piston continues alone to lift. When it arrives at the end ofits run, it allows the oil to escape through the holes 71. and fall downin the tank M, so that the motor may continue to run without anydisadvantage for the apparatus.

The three telescopic tubes Y Y Y are provided with longitudinal groovesy g 3 and keys 2 2 2 so that when the inner tube Y arrives at the end ofits run the lower abutment of its groove y bears against the key 2 onthe interior of the second tube Y and raises this latter in its liftingmovement. In the same manner the outer tube Y is raised by the abutmentof the groove end 3 against the key 2 The whole run of the threetelescopic tubes Y Y Y is equal to the whole run of the two pistons eand i.

In addition to the above described device there is also a spring p whichweaken the shocks when the telescopic tubes are lowered. The apparatusis also provided with a locking device which looks the standard at everydesired position, and which consists in an eccentric roller 0 (Figs. 1and 2) capable of wedging the tube Y under the actionof a lever 1'.

The electric current is supplied to the motor by means of any suitableconnection.

What I claim and desire to secure by Letters Patent is 1. Pedestal chairfor dentists having in combination a base, a casing in the baseseparated in two tight chambers by a partition,

This rod 70 passes loosely.

an electric motor in one chamber, a pump, means for transmitting themovement from the electric motor to the pump, telescopic tubes, andcanals provided with valves and putting in communication the pump withsaid. telescopic tubes, substantially as de- I scribed.

2. Pedestal chair for dentists having in combination a base, a casing inthe base separated in two tight chambers by a partition,

an electric motor in one chamber, a pump,

means for transmitting the movement from the electric motor to thepump,telescopic tubes, canals provided with valves and putting incommunication the pump with said telescopic tubes, and oil pipesperforated above the moving parts of the apparatus for lubricating same,substantially as de-,'

scribed.

3. Pedestal chair for dentists having in combination a base, a casing inthe base separated in two tight chambers b a partition, an electricmotor in one cham er, a pump, means for transmitting the movement fromthe electric motor to the pump, telescopic tubes, canals provided withvalves and putting in communication the pump with said telescopic tubes,oil pipes perforated above the moving parts of the apparatus forlubricating same, another pump acted on by a pedal, and pipes incommunication with those of the other pump, substantially as described.

4. Pedestal chair for dentists having in combination a'base, a casing inthe base separated into two chambers by a partition, an electric motorin one cham er, a pump, means for transmitting movement from theelectric motor to the pump, a tube mounted

